Biofilms Contain Poly-GlcNAc and Contribute to Antibiotic Resistance

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2020 Nov 16

PMID 33193233

Citations 13

Authors

James M Daubenspeck

Arthur H Totten

Jason Needham

Monica Feng

Mitchell F Balish

T Prescott Atkinson

Kevin Dybvig

Affiliations

Soon will be listed here.

Abstract

is an important etiologic agent of non-gonococcal urethritis (NGU), known for chronicity and multidrug resistance, in which biofilms may play an integral role. In some bacterial species capable of forming biofilms, extracellular polymeric substances (EPS) composed of poly--acetylglucosamine (PNAG) are a crucial component of the matrix. Monosaccharide analysis of strains revealed high abundance of GlcNAc, suggesting a biofilm-specific EPS. Chromatograms also showed high concentrations of galactose and glucose as observed in other mycoplasma species. Fluorescence microscopy of biofilms utilizing fluor-coupled lectins revealed differential staining of biofilm structures. Scanning electron microscopy (SEM) showed increasing maturation over time of bacterial "towers" seen in biofilm development. As seen with , organisms within fully mature biofilms exhibited loss of cell polarization. Bacteria associated with disrupted biofilms exhibited decreased dose-dependent viability after treatment with antibiotics compared to bacteria with intact biofilms. In addition, growth index analysis demonstrated decreases in metabolism in cultures with disrupted biofilms with antibiotic treatment. Taken together, these data suggest that biofilms are a contributing factor in antibiotic resistance.

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